C++之string板子题

class Substr {
public:
    vector<bool> chkSubStr(vector<string> p, int n, string s) {
        // write code here
        vector<bool> ret;
        if( n<=0 )
        {
            return ret;
        }

        for(string str: p)
        {
            //找不到，返回位置为-1；
            if( -1 != s.find(str,0) )
            {
                ret.push_back( true );
            }
            else
            {
                ret.push_back( false );
            }
        }

        return ret;
    }
};